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Re: Big Triode

Subject:       Re: Big Triode
       Date:   Sun, 18 May 1997 20:06:14 -0700
       From:   gene lambert <tesla-at-cyberverse-dot-com>
Organization   Tesla Electric, LTD
         To:   Tesla List <tesla-at-pupman-dot-com>
        CC:    tesla-at-poodle.pupman-dot-com
 References: 
            1


Tesla List wrote:
> 
> Subject:  Re: Big Tiode
>   Date:   Sun, 18 May 1997 10:06:14 +1000
>   From:   Ralph Down <rjdown-at-fan-dot-net.au>
>     To:   Tesla List <tesla-at-pupman-dot-com>
> 
> >> Hi All,
> >> I went to a local Hamfest last weekend and scored a large triode tube
> >> (valve).  It is a Philips TB 4/1250
> >> about 4 1/2" diameter and 6" tall with a very substantial anode.  I have
> >> tried searching on the web for info on this tube, but so far no luck.
> >> Does anyone have any data on this tube? - anode voltage, heater voltage,
> >> wattage, pin out etc?
> 
> >> Any help on Tube Tesla coils would be most welcome.
> >> Regards
> >> Ralph Down
> 
> >>
> >>
> >Ralph,
> >
> >That tube sounds like a tetrode with 1250 watts plate dissipation
> >rating.
> >Your 0.001 mfd mica cap should be O.K. for your tank cap.
> >Perhaps John Freau can be of more help on this than I.
> >
> >Good luck, and nice score!
> >
> >rwstephens
> >
> >
> >
> Thanks for the info
> I have had a bit more of a look through the glass envelope and done some
> tests with a multimeter.
> It has a 5 pin base.  Three pins appear connected together by a flat
> plate
> at the bottom of the glass envelope and the centre of this plate has a
> cylindrical tube about 1/2" diam mesh which extends upwards inside the
> anode
> which is about 1 1/4" diam and connected to a terminal on top of the
> envelope.
> I surmise that these three common pins are the grid connection and the
> other
> 2 must be a directly heated cathode.
> So it looks like a triode with directly heated cathode.
> I am going to guess that the heater voltage is 4 volts (TB 4/1250)
> I have been told that B signifies a triode
> I'm not sure what T indicates (maybe Transmitter Tube)
> The 1250 is probably either anode voltage or power rating.
> 
> Can anyone help with a schematic diagram for a Tube Tesla using the
> above
> tube, a .001 7kv mica cap and a 2.5kv microwave oven trannie?
> 
> There is not much discussion about Tesla coiling on this list recently,
> maybe this will get us all back on topic a bit!
> 
> Thanks again
> Ralph Down
> Today is the tomorrow you worried about yesterday....... and everything
> is O.K.


Ralph:
You may remember, I am the "Other" guy with the EEV CX1140 tube. I too,
am looking for information on tube coiling. Our tubes sound roughly
similar, and I hink both would make a great start for a TC. Keep us
posted.

Gene Lambert